[IPU] Add reset dataloader hooks to training type plugin 3/n #7861
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What does this PR do?
This PR adds reset data-loader hooks to the training type plugin and accelerator.
The requirement here was that
process_dataloader
(The currently exposed hook) happens too late in the flow, not updating the progress bar etc. This till now has been fine as the assumption is the size of the batches do not change, however this is not true with IPUs.Before submitting
PR review
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